Process for purifying and sterilizing water



ofcarbon and v Patented Apr. 1 8,

uniraosmras PATENT OFFICE V aurora-Armin, F 'KARLISZBAD, czEonosLovAxIA imoonss Fort PUItIFYING AND srnnimz me wa'rnn No Drawing. Application filed February 7, 1930; Serial No. 426,774,:3nd in the Netherlands March 28,

This invention relates to a process for purifying and sterilizing Water. I

In order to destroy as far as possible, the dissolved organic substances present in water 5 and in particular to kill all germs, it has already been .p roposed to add tothe Water a 1 relatively largequantity of chlorin and to remove the excess of free chlorin remaining' However, in carrying out such processes,

certain disadvantages occur which prevent their lntroductlon lIltO pract cal l use for water treatment. v

addition of" large quantities of chlorin 'to the raw water, germs appear after a short time in the pure water. Thisappearanceof germs 1n the pure water,as tests have shown,

depends on the fact thatcarbonaceoussub-p stances, absorb germs, and as the carbonsurfaces afford favorable fields=of the growth of collected germs which per chance have evaded the action of the chlorin, at any zone of the carbon in which the freed chlorin has already been-removed from the water, these; germs will continually infect thewater fio'w ing through the carbon.

The object of this invention is e e in which in known manner an excess of free 7 or activechlorin is employed and wherein'a carbonaceous materlal is usedffor the dechlorinating process substance but in which the described The complete conversion of. the chlorin passing over-the surface of the carbon, .into the chlorin ion takes place when a definite relation is maintained between the quantity thelinear velocity of flow of "the water. i V f I The course of the reactionjof this conver-' sion proceeds in accordance with the'law of I mass-action, namely in accordance with the 5 course of a mOno-molecular)v reaction, so that a decrease of concentration is produced, whereby, at, a :zone of the carbon relatively remote from the chlorin supply, such'a slight concentration of chlorin is provided that V in; case germs are located 1n this zone which iS flushing of chlorin-containing water through i for the quantitative conversion of the chlorin a; process i disadvantages are wholly avoided. i

' crease to such an extent as to be'bactericidal,

poor in V chlorin (or already entirely free from chlorin) these germs will develop and multiply. a

It has now been found that this disadvantage may be remedied if all parts of the carbon areiperiodically permeated with water having abactericidal chlorin content and therebyany germs present are killed, thus avoiding any re-infection of the water.

1 .It has also been found that this periodica all parts of the carbon is attained if the pe riod of flow of the chlorin-containing water,

1 V I r through the carbon is shortened, so thatthe Namely, it was found that even upon-the" decrease in concentration of the freechlorin within a,v given layer of carbon does not fall ing the time offlowing-through necessary into the chlorin ion, or by causing the suptake'place alternately in'such way that all parts of the carbon are permeated one after another by chlorin-containing water or by periodicallyadding a substance of alkaline reaction to the water, during a short inter- V ruption of the operation. 1 1 In all cases a periodic sterilizing of the carbon by means of chlorin'is attained,

Iclaim: e l. Process for periodically purifying carbon servin vthe purpose of changing the chlorine, 'w ich has been utilized in steriliz Y ing water, into chlorine ions, which comprises periodically adding a soluble'alkali reacting substance {to the chlorine containing Water before it passeslthrough thecarbon;

comprising periodicallycausing the mini- 1 mum concentration of thefree chlorin in the water passing through said carbon to in and periodically adding an alkali to the chlo min-containing water toobtain the, desired increase ofmlnimum chlorin concentration.

.RUDQLF ADLER, 100

7 from-water sterilized thereby, said process 

